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Contingencies and Guaranty (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Apr. 30, 2023 | Oct. 31, 2022 | Sep. 30, 2022 | Feb. 28, 2021 | Dec. 31, 2024 | Dec. 31, 2023 | Nov. 30, 2024 | Sep. 30, 2024 | Mar. 31, 2024 | Mar. 31, 2023
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability |  |  |  |  |  |  | $ 20,000 | $ 22,033 |  |  |  | $ 15,000 |
Contingent liability |  | $ 1,000 |  |  |  |  |  | 5,397 | $ 1,000 |  |  | 1,000 |
Payments to acquire intangible assets |  |  |  |  |  |  |  | 12,621 | 14,809 |  |  |  |
Increase in deposit assets |  | 7,500 |  |  |  |  |  |  |  |  |  |  |
Prepayments received |  | 107,060 | $ 80,265 |  |  |  |  | 126,061 | $ 107,060 |  | $ 126,627 | $ 122,212 | $ 60,759
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone payment received |  | 200 | 25,200 |  |  | $ 200 |  |  |  |  |  |  |
Delivery delay adjustments |  |  | $ 1,100 |  |  |  |  |  |  |  |  |  |
Lower Colorado River Authority (LCRA) | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Initial payment received |  | $ 15,000 |  |  |  |  |  |  |  |  |  |  |
Short-term contingent consideration |  |  |  |  |  |  |  | 400 |  |  |  |  |
Long-term contingent consideration |  |  |  |  |  |  |  | 14,600 |  |  |  |  |
Lower Colorado River Authority (LCRA) | Licensing Agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability |  |  |  |  |  |  |  |  |  | $ 1,400 |  |  |
Payments to acquire intangible assets |  |  |  | $ 30,000 |  |  |  |  |  |  |  |  |
Oncor Electric Delivery Company LLC | Licensing Agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term contingent consideration |  |  |  |  |  |  |  | 4,000 |  |  |  |  |
Long-term contingent consideration |  |  |  |  |  |  |  | 6,000 |  |  |  |  |
Broadband licenses granted estimated consideration | $ 102,500 |  |  |  |  |  |  |  |  |  |  |  |
Initial consideration received | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement term (in years) |  |  |  |  | 20 years |  |  |  |  |  |  |  |
Prepayments received |  |  |  |  |  |  |  | 67,100 |  |  |  |  |
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayments received |  |  |  |  |  |  |  | $ 62,800 |  |  |  |  |
SDG&E |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  | $ 50,000 |  |  |  |  |  |

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